Resetting an Automation Server to DFU Mode

If the automation server firmware is damaged, the automation server can be put in DFU (Device Firmware Upgrade) mode to be able to communicate on the USB device port.

After the reset operation and the initial boot process, the upgrade process can be started, using the USB device port. It is also possible to retrieve debug information from the device.

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There are four different types of reset for the automation servers: warm start, cold start, reset, and reset to DFU mode. Depending on the type of reset, the automation server can be reset using the reset button or a command from WorkStation.

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Figure: Location of reset button and USB device port on different server models

You can use a straigthened segment of a paper clip or a similar tool to press the reset button.

Table: Automation Server Reset Functions

Type	Triggered by	Description	Variable values	Configuration, Historic database	IP settings
Warm start	Command from WorkStation	Stops the automation server application and then restarts the application.	Affected according to the configured retain levels for the variables	Retained	Retained
Cold start	Command from WorkStation	Stops the automation server application and then restarts the application.	Affected according to the configured retain levels for the variables	Retained	Retained
Reset	Short push on Reset button Power return	Stops the automation server application and the operating system and then restarts the operating system and the application.	Affected according to the configured retain levels for the variables	Retained	Retained
Reset to DFU mode	3 pushes on Reset button within 2 seconds	Puts the automation server into DFU mode, which enables Device Administrator to communicate with the server.	Not applicable	Not retained	Not retained

Parameters and variables that are used to define the system or contain important data in the automation server can be retained in a permanent memory. These parameters and variables are automatically saved in the event of power failure, or request for restart and are reloaded after startup.

You can define what kind of events that retention for the parameters and variables should apply.

Retain Levels for Variables

Variables have a configurable retain level, which controls if the value of the variable is retained after a restart of the automation server. There are three retain levels:

No
Warm start
Cold start

The following table lists what is retained after a warm start, cold start, or reset based on the configured retain level.

Table: Retained Variable Values Depending on Reset Type and Retain Level

Reset type	Retain level: No	Retain level: Warm start	Retain level: Cold start
Warm start	Default value ^a Values configured by a user or application are lost.	Variable retains last value configured by a user. Values configured by an application are retained.	Variable retains last value configured by a user. Values configured by an application are retained.
Cold start	Default value ^a Values configured by a user or application are lost.	Variable retains last value configured by a user. Values configured by an application are lost.	Variable retains last value configured by a user. Values configured by an application are retained.
Reset	Default value ^a Values configured by a user or application are lost.	Variable retains last value configured by a user. Values configured by an application are retained.	Variable retains last value configured by a user. Values configured by an application are retained.

Reset type

Retain level:

Warm start

Retain level:

Cold start

Warm start

Default value ^a

Values configured by a user or application are lost.